code: def __call__(self, _):
      self.captured = (pathlib.Path() / "Dockerfile").read_text()
  
file_path: datasette/tests/test_package.py
imports: from click.testing import CliRunner
  from datasette import cli
  from unittest import mock
  import os
  import pathlib
  import pytest
label_desc: Use image node_id 1 for calling the CaptureDockerfile obj's underlying member method code with example usage: obj.__call__(_) without return types